A Warm Welcome Back > capiga 
You Will Always Find Someone Here To Help You
New To Silent Hunter <> Need Help <> Click On My Thread Link. 
Subsim <> How To Donate <> See The Benefits <> Support The Community 
Post #24 Shaefer’s Season 2 Let's Play Silent Hunter 5 YouTube Videos
You cannot redraw existing lines etc with the tools with the game paused.
The only way around this is to erase the existing line and draw a new one.
This goes for all the tools.
Peter